Jun 7, 2022
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Fossil Shark Teeth ID Project - Part 4
I am currently working on a shark teeth ID project. It is a personal project I am working on because I got gifted a multitude of fossil shark teeth of various species.
These are shark teeth ID#011 - ID#020. If I misidentified anything, or if anyone has any questions or wants to be tagged in this project, please let me know:)
ID#011
Species - Scientific Name: Broad-Tooth Mako - Comspolitodus hastalis
GOD I love cow sharks I researched them for like three days a few years ago and they're SO cool i'm gonna research them again so I can talk more about them and annoy everyone around me
Fossil Shark Teeth ID Project - Part 2
I am currently working on a shark teeth ID project. It is a personal project I am working on because I got gifted a multitude of fossil shark teeth of various species.
Up untill now I have only been able to identify one shark species, because the teeth are so characteristic. The teeth (seen in the picture below) belong to the species the Broadnose Sevengill Shark or Notorynchus cepedianus.
The Broadnose Sevengill Shark belongs to the family of Cow Sharks or Hexanchidae, which are considered the most primitive of sharks.
I actually just recently watched a documentary covering Broadnose Sevengill Sharks with Forrest Galante. It was called 'Alien Sharks: Strange New Worlds', it was from Sharkweek 2023 and it was really good!
I also have two different teeth which I am having a lot more difficulties with identifying (see the two pictures below). If anyone has any clue of which species these teeth may belong to, please let me know:)
Tags: @darkcybertron @cornerstars
Bluntnose Sixgill Shark Fact Sheet!
It’s about time I made one of these, considering all the time I’ve put into researching them. I still have. . . 30 more papers to read out of 64, so I will update this post as I learn more.
> The taxonomic name of the bluntnose sixgill shark is Hexanchus griseus. It is under the family Hexanchidae, which are known as the “cow sharks.”
> Sixgills are globally distributed on continental slopes, shelves, and sea mounts, except for the Arctic and Southern oceans.
> Sixgills are ovoviviparous, which means their young develop in egg sacks within the mother’s uterus. They give birth to up to 108 pups and are polyandrous, which means one litter was multiple contributing fathers.
> Sixgill pups start out with a total length of 68-73cm, and can grow up to 5m!
> Sixgills occupy deep waters during the day and shallower waters at night, migrating up and down the sea floor slopes at dusk and dawn.
> A group of sixgills is called a shoal. The largest recorded gathering of sixgills was a shoal of 21 sharks.
> Sixgills share a genus with two other species, the Atlantic sixgill shark (Hexanchus vitulus) and the bigeye sixgill shark (Hexanchus nakamurai)
> Hexanchid teeth have been found as far back as the Eocene epoch, about 33.5 to 56 million years ago.
> Sixgills growing up in Puget Sound have friends! They can often be found in pairs with same-sex conspecifics.
> Sixgills are generalist scavengers that spend most of their time above the sea floor (epibenthic).
> These sharks occupy depths up to 2500m.
> Sixgills give birth about once every two years.
> Sixgills are docile sharks, and have never harmed a human.
> Males have “scrolls” which sheath the claspers, making sexing at a glance more difficult than with other sharks species.
> We have yet to develop a method of determining the age of these sharks due to poor skeletal calcification. We don’t know how old they are or how long they live.
> Sixgills have comb-like teeth on the lower-jaw which allow them to saw and shear off chunks of flesh from bodies.
> A sixgill shark was responsible for biting a submarine fiber optic cable on a certain clip recorded by a commercial ROV in 2003!
> A sixgill shark once gave a ride to a crab on her fin! Her name is Crusty.
@ everyone asking me to not eat the internet cables: